Incidentally, I have a slightly improved version of the missing greatwardifferent index (HTML), fixing a few more broken links, should any like a copy e-mailed.
Several different colour processes available then, some arguably/technically superior to Kodachrome. See http://cas.awm.gov.au/item/P03631.209, one of several hundred WW1 colour photographs (Paget Plates) by Frank Hurley in the AWM collection. There are links to others here and there in these forums - I know I've posted this one before - http://cas.awm.gov.au/item/P03631.035.