Skip to content 19194760-5288823620_bbdf1cbb06_o[1]
https://pulpcovers.com/wp-content/uploads/2010/12/19194760-5288823620_bbdf1cbb06_o1.jpg
19194782-5288825032_cd6a84fb50_o[1]
https://pulpcovers.com/wp-content/uploads/2010/12/19194782-5288825032_cd6a84fb50_o1.jpg
19194803-5288218801_e76c4b5b50_o[1]
https://pulpcovers.com/wp-content/uploads/2010/12/19194803-5288218801_e76c4b5b50_o1.jpg
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https://pulpcovers.com/wp-content/uploads/2010/12/19194828-5288826324_14a7f9c071_o1.jpg
Three of these are signed Helmert, which I suppose is Herbert Helmert, given the similarity of style:
https://www.askart.com/artist/Herbert_Helmert/11106541/Herbert_Helmert.aspx
Dutch Artist is Helmert R. Miller (also known as R.M. Helmert, pen name of Helmert Mulder).
A few works here :
https://www.flickriver.com/groups/1434083@N23/pool/interesting/