The collection includes sets of architectural plans and drafts ordered by year and subject, from 1941-1989. The first series comprises Johnson's university studies commencing 1941, and including his Masters Thesis (1949). The second series covers Johnson's overseas work including East Africa and Burma, and ongoing commissions in Britain. The third and largest series primarily covers Johnson's period in Australia, including work for the University of Western Australia, National Capital Development Commission, Canberra, and other Australian institutions.