Courtesy Chris Watson Collection and Warren Bernard Collection.
Robinson drew a number of advertising pamphlets for Connolly Leather. The best reference book for these is "Heath Robinson Advertising" by Geoffrey Beare (Bellew, 1992). The full list is:
Nothing Like Leather (1920) 12pp
Light on Leather (1922) 24pp
Tough Testimonials (1924) 32pp (Bateman cover; See Bateman gallery)
Nothing Takes the Place of Leather (1925) 20pp
Leather Breeding on the Wandle (1927) 20pp
Cattle Culture (1930) 20pp
Leather For Ever (1931) 20pp
Heath Robinson on Leather (1932) 48pp
Connolly Chronicles (1933) 20pp
Connolly-Land (1934) 14pp
The Business Man's Encyclopaedia Connollyca (1935) 20pp
Heath Robinson on Leather (1938) 48pp