Enumeration District Many genealogy researchers have created web pages advertising their services and can be contacted via e-mail. Their rates vary greatly, as do their quality. A quick look up in the Soundex should not cost very much, particularly since you needn't obtain a hard copy of the Soundex card. Of course that method would entail two trips to the FHC and a wait of at least a few days. Whatever you pay should be what that service is worth to you.
Many researchers like to collect all the families with the same surname in the state.
Unfortunately, Boettcher is the German equivalent of Cooper and nearly 200 families carried this name in 1920 in Wisconsin. Even if I were researching this Soundex microfilm myself, I doubt I would record all the families. Enumeration Pages To truly complete census research, the actual enumeration pages are required. The same three options exist as did for the Soundex page. Again, the NARA web site has a microfilm listing by enumeration district.