Ah-ha. Looked up the US Census for 1970 and apparently one HAD to state one’s income...scroll down to #40. https://usa.ipums.org/usa/voliii/items1970.shtml However, I don’t remember answering so many questions otherwise. Other censuses in previous and subsequent years seemed less complicated, and certainly the ones online or by mail in recent times are very simple. Future family researches will be disappointed at the paucity of information, therefore. Maisie