I found these author portraits on this weblog. From left to right: Jef Last, Jan Engelman, Maurits Dekker, Hendrik de Vries, Albert Helman, A. Roland Holst. The only legible signature reads "Rafa", but I have no idea who he is. Still, ancient Dutch author portraits, such a lovely find. Do any of you in my dear readership know more?
nice style of portraitdrawing!