Bill K4CIA recently uploaded three old Heathkit catalogs to his website (which contains other old docs besides Heath).
They’re big files though; if you only download one of them, make it the 1958 version – it has a full schematic of all the amateur-related products. The other years are 1967 and 1969.
And a kit for polarography? I’ve got a dictionary around here somewhere…..
Here they are – files sizes, in order are 108, 118 and 300 MB.