Via allfreecrafts – Crochet Doilies in Imitation of Point Lace Work I found the Antique Pattern Library.
They looked for books where the copyright has expired (public domain) and scanned the instructions. Those scans are offered for free (under certain circumstances) as PDFs angeboten (Look out, some of them are quite large, but unfortunately they haven’t noted the size).
Have fun with crochet, knitting, tatting, netting, embroidery, needle lace, beading and other needlework patterns ;-)
Links:
Antique Pattern Library
allfreecrafts – Crochet Doilies in Imitation of Point Lace Work