Hollow Dark Places by Hendrick van Helsing, published in Amsterdam in 1885, is cited by Philip José Farmer in Doc Savage: His Apocalyptic Life as a chief source for his account of the life of the notorious Sir Patrick Clarke Wildman. Van Helsing's book argues that Wildman was performing experiments which made use of notebooks penned by Victor Frankenstein himself.

It is generally assumed that the author of Hollow Dark Places was a relative of Abraham Van Helsing, the Dutch professor who leads the campaign against Count Dracula in the novel by Bram Stoker.

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