91. The places at which you begin and end work on any street are to be marked by heavy lines in ink (—) across the first and second columns. (See illustrative example, line 8.)
97. If two or more houses are situated on a single lot, that is, one or more houses located in the rear of the house fronting on the street, avenue, court, place, or alley for which the enumeration is being made, designate the first (or front) house by the usual house number on the street, the second house by the same number with "R1" added, the third house by the same number with "R2" added, and so on, until all the houses are properly marked with reference to the house number of the lot on which they are situated.
The first two columns (not numbered in series) on the population schedule require the entry, in cities, of the street and street number of each occupied dwelling house. The name of the street should be written lengthwise of the space.