Context:

Mentioned at the end of the episode as 'the most amazing book on Poland's experience in the Second World War' that they had discussed extensively (note: the transcript renders the author name as 'Halleck Hans' but this appears to be a transcription error)

Context:

Described as 'a brilliant book' on Poland in the Second World War. The author is identified as an Anglo-Polish historian. The book is cited multiple times for statistics about Poland's defense budget and military capabilities, as well as justifications used by various parties during the invasion.