Enumerators were instructed to ???visit every house, building, tent, cabin, hut, or other place in which any person might live or stay, to insure that no person is omitted from the enumeration??? and to count ???each person alive at the beginning of the census day, i.e., 12:01 A.M. on April 1, 1940.??? Census enumerators wrote Ab after names of people who belonged to the household but were absen