Original Hewlett Packard Journal June 1968 Volume 19 Number 10

Hewlett-Packard HP-12C Calculator Owner’s Handbook And Problem-Solving Guide

HP-12C Owner’s Handbook And Problem-Solving Guide Hewlett-Packard Calculator

Hewlett Packard HP-12C Owner's Handbook and Problem-Solving Guide 1982 Vintage

HP 12c Owner's Handbook and Problem-Solutions Guide by Hewlett Packard Sep 1983

Hewlett-Packard HP-12C Calculator Owner’s Handbook And Problem-Solving Guide

HP-41CX Owner’s Manual Vol 2 Operation in Detail 1983 Hewlett Packard Guide

Hewlett Packard I/O ROM and Interface Pocket Guide Series 80 00087-90122 1981