The enumerator's books are not the same as the enumerator's summary books in the 1911 census.
From the 1911 Census report.
"In one respect this routine differed materially from that followed at previous censuses. At these the enumerator was required to copy the replies to the questions on the schedule into an “enumeration book” in which form the information was very much more compactly arranged, blank spaces being eliminated. It was from these enumeration books that the census tables were prepared. This procedure had the advantage of presenting the information in a much more legible, compact and convenient form for tabulation, but it involved much laborious work in copying …….It was therefore decided to omit this copying process in 1911, and to tabulate from the schedules themselves…..
In order to ensure that schedules were left at all inhabited buildings it was the duty of the enumerator, as at previous censuses, to carry a “memorandum book” while delivering the schedules, in which he entered, street by street, the address and description of every building, inhabited or not, with the names of the heads of families. After collecting and numbering the schedules, and entering the total number of males and females on each schedule, all these particulars were copied, from the memorandum book and the schedules concurrently, into a “summary book.” These “enumerator’s summaries,” prepared primarily in order to enable the registrar to ensure by checking them that no housed population was omitted in the enumeration, played a very important part….in the tabulation.
Stan