diff --git a/src/bibapi/_transformers.py b/src/bibapi/_transformers.py
index 5ec1ae0..e55e8e1 100644
--- a/src/bibapi/_transformers.py
+++ b/src/bibapi/_transformers.py
@@ -375,7 +375,6 @@ class RDSData:
     def transform(self, data: str):
         # rds_availability = RDS_AVAIL_DATA()
         # rds_data = RDS_GENERIC_DATA()
-        print(data)
 
         def __get_raw_data(data: str) -> list:
             # create base data to be turned into pydantic classes
diff --git a/src/bibapi/schemas/bookdata.py b/src/bibapi/schemas/bookdata.py
index ad1df96..b4636df 100644
--- a/src/bibapi/schemas/bookdata.py
+++ b/src/bibapi/schemas/bookdata.py
@@ -1,3 +1,7 @@
+"""A dataclass representing book data from the library system and catalogue."""
+
+from __future__ import annotations
+
 import json
 from dataclasses import dataclass, field
 from typing import Any
@@ -7,6 +11,15 @@ import regex
 
 @dataclass
 class BookData:
+    """A dataclass representing the book object.
+
+    Returns
+    -------
+    self : BookData
+        The book data object with attributes like title, author, year, etc.
+
+    """
+
     ppn: str | None = None
     title: str | None = None
     signature: str | None = None
@@ -14,7 +27,7 @@ class BookData:
     link: str | None = None
     isbn: str | list[str] | None = field(default_factory=list[str])
     author: str | None = None
-    language: str | list[str] | None = field(default_factory=list)
+    language: str | list[str] | None = field(default_factory=list[str])
     publisher: str | None = None
     place: str | None = None
     year: int | None = None
@@ -25,10 +38,11 @@ class BookData:
     old_book: Any | None = None
     media_type: str | None = None
     in_library: bool | None = None  # whether the book is in the library or not
-    libraries: list[str] | None = field(default_factory=list)
+    libraries: list[str] | None = field(default_factory=list[str])
     medianr: int | None = None  # media number
 
-    def __post_init__(self):
+    def __post_init__(self) -> None:
+        """Run Post-initialization processing."""
         self.library_location = (
             str(self.library_location) if self.library_location else None
         )
@@ -38,12 +52,12 @@ class BookData:
         self.year = regex.sub(r"[^\d]", "", str(self.year)) if self.year else None
         self.in_library = True if self.signature else False
 
-    def from_dict(self, data: dict) -> "BookData":
+    def from_dict(self, data: dict[str, Any]) -> BookData:
         for key, value in data.items():
             setattr(self, key, value)
         return self
 
-    def merge(self, other: "BookData") -> "BookData":
+    def merge(self, other: BookData) -> BookData:
         for key, value in other.__dict__.items():
             # merge lists, if the attribute is a list, extend it
             if isinstance(value, list):
@@ -89,12 +103,12 @@ class BookData:
             return "Druckausgabe"
         return None
 
-    def from_string(self, data: str) -> "BookData":
+    def from_string(self, data: str) -> BookData:
         ndata = json.loads(data)
 
         return BookData(**ndata)
 
-    def from_LehmannsSearchResult(self, result: Any) -> "BookData":
+    def from_LehmannsSearchResult(self, result: Any) -> BookData:
         self.title = result.title
         self.author = "; ".join(result.authors) if result.authors else None
         self.edition = str(result.edition) if result.edition else None
diff --git a/src/bibapi/webrequest.py b/src/bibapi/webrequest.py
index be2ddd2..1d996e3 100644
--- a/src/bibapi/webrequest.py
+++ b/src/bibapi/webrequest.py
@@ -1,5 +1,9 @@
+"""A module to request data from the internal catalogue data."""
+
+from __future__ import annotations
+
 from enum import Enum
-from typing import Any
+from typing import TYPE_CHECKING, Any
 
 import requests
 from bs4 import BeautifulSoup
@@ -16,7 +20,9 @@ from src.bibapi._transformers import (
     RDSData,
     RISData,
 )
-from src.bibapi.schemas.bookdata import BookData
+
+if TYPE_CHECKING:
+    from src.bibapi.schemas.bookdata import BookData
 
 API_URL = "https://rds.ibs-bw.de/phfreiburg/opac/RDSIndexrecord/{}/"
 PPN_URL = "https://rds.ibs-bw.de/phfreiburg/opac/RDSIndex/Search?type0%5B%5D=allfields&lookfor0%5B%5D=&join=AND&bool0%5B%5D=AND&type0%5B%5D=au&lookfor0%5B%5D=&join=AND&bool0%5B%5D=AND&type0%5B%5D=ti&lookfor0%5B%5D=&join=AND&bool0%5B%5D=AND&type0%5B%5D=ct&lookfor0%5B%5D=&join=AND&bool0%5B%5D=AND&type0%5B%5D=isn&lookfor0%5B%5D=&join=AND&bool0%5B%5D=AND&type0%5B%5D=ta&lookfor0%5B%5D=&join=AND&bool0%5B%5D=AND&type0%5B%5D=co&lookfor0%5B%5D=&join=AND&bool0%5B%5D=AND&type0%5B%5D=py&lookfor0%5B%5D=&join=AND&bool0%5B%5D=AND&type0%5B%5D=pp&lookfor0%5B%5D=&join=AND&bool0%5B%5D=AND&type0%5B%5D=pu&lookfor0%5B%5D=&join=AND&bool0%5B%5D=AND&type0%5B%5D=si&lookfor0%5B%5D={}&join=AND&bool0%5B%5D=AND&type0%5B%5D=zr&lookfor0%5B%5D=&join=AND&bool0%5B%5D=AND&type0%5B%5D=cc&lookfor0%5B%5D=&join=AND&bool0%5B%5D=AND"
@@ -28,10 +34,11 @@ ISBN = "RDS_ISBN"
 AUTHOR = "RDS_PERSON"
 ALLOWED_IPS = [
     "193.197.140.245",  # PHFR Internal
+    "193.197.140.249",  # PHFR Eduroam
 ]
 HEADERS = {
     "User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 \
-            (HTML, like Gecko) Chrome/44.0.2403.157 Safari/537.36",
+            (HTML, like Gecko) Chromes/44.0.2403.157 Safari/537.36",
     "Accept-Language": "en-US, en;q=0.5",
 }
 RATE_LIMIT = 20
@@ -60,7 +67,8 @@ class WebRequest:
         self.public_ip = None
         self._can_run()
         if self.public_ip not in ALLOWED_IPS:
-            raise PermissionError("IP not allowed to access the requested data.")
+            e = f"IP {self.public_ip} not allowed to access the requested data"
+            raise PermissionError(e)
 
     def _can_run(self) -> None:
         """Check if requests can be made."""
@@ -81,13 +89,13 @@ class WebRequest:
         self.use_any = True
         return self
 
-    def set_apparat(self, apparat: int) -> "WebRequest":
+    def set_apparat(self, apparat: int) -> WebRequest:
         self.apparat = apparat
         if int(self.apparat) < 10:
             self.apparat = f"0{self.apparat}"
         return self
 
-    def get_ppn(self, signature: str) -> "WebRequest":
+    def get_ppn(self, signature: str) -> WebRequest:
         self.signature = signature
         if "+" in signature:
             signature = signature.replace("+", "%2B")
@@ -215,12 +223,12 @@ class BibTextTransformer:
         self.data = None
         # self.bookdata = BookData(**self.data)
 
-    def use_signature(self, signature: str) -> "BibTextTransformer":
+    def use_signature(self, signature: str) -> BibTextTransformer:
         """Use the exact signature to search for the book"""
         self.signature = signature
         return self
 
-    def get_data(self, data: list[str] | None = None) -> "BibTextTransformer":
+    def get_data(self, data: list[str] | None = None) -> BibTextTransformer:
         RIS_IDENT = "TY  -"
         ARRAY_IDENT = "[kid]"
         COinS_IDENT = "ctx_ver"