This is the third supplement to the Bibliography and Abstracts on Thermostat Metals 1806;—1959, Special Technical Publication No. 288, published by the American Society for Testing and Materials. The first supplement, STP No. 288-A, contained additional references for the years covered by STP No. 288 and references for the years 1960 – 1961. The second supplement, STP No. 288-B, contained additional references for the years covered by STP No. 288 and STP No. 288-A and references for the years 1962;—1965. This supplement, STP No. 288-C, contains additional references for the years covered by STP No. 288, STP No. 288-A and STP No. 288-B and references for the years 1966 – 1973.