My cousin K3WPN forwarded me this link that I've found very helpful. It includes most if not all callbooks from 1906 to 1997 in PDF format. They are searchable (takes a few minutes so don't give up) by any text: name, call sign, or even address. Old Ham Radio Call Books 1906-1997 and ARRL Handbooks <https://leehite.org/callbooks/> 73, Rick, KS4XO