This is a series of books (until now 8 books) about the weapons of the German police: Dienstwaffen der deutschen Polizei und Gendarmerie / Kapitel 3: Weimarer Republik 1919-1933 by Horst Friedrich (2018 / 23 x 28 / 400 p.).
Indeed. The Weimar volume is actually not listed on the linked webpage, but Horst Friedrich told me not too long ago he still has plenty in stock, and he does ship to the US. You can contact him directly at the e-mail given. It's well worth having for anyone interested in this era. It's 60 Euros plus shipping.
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