When talking with librarians about this you must ask for "non-population
United States Census enumerators schedules" in the format:
"Federal non-population census schedules, STATE, DATE...."

I've just finished using the federal nonpopulation census schedules for
Michigan, 1850-1880, which appear on Microfilm in the Michigan State Archive
under the library of congress call number: HB1335.M5 N66 1850 (with each
roll having a number attached to that call number).  I've also used them in
Utah and Nevada.  The microfilms are incomplete by county or enumerator's
district, but when you find records the information is sweet!

I quote:

The Census of Manufactures was first taken in 1810 as part of the 3rd
decennial census of the United States.  It was part of the decennial census
from 1810-1900, except for the year 1830 when no census was made.  The first
separate census of manufactures took place in 1905.  It was then done every
five years from 1905-1919 (1909 and 1919 were part of the 1910 and 1919
decennial censuses) and biennially thereafter from 1921 to 1939 (1929 and
1939 are part of the 1930 and 1940 decennial censuses).  Interrupted by
World War II, the census of manufactures began again in 1947 and lasted
through 1992.  Starting in 1997 it is classified in the Economic Census (C
3.277).  (from the 1997 Guide to US Government Publications, page 106).

1810    I 4.5: Bk. 2
1820    I 5.5: Bk. 2
1830    not taken
1840    I 7.5: Bk. 2
1850    I 8.5: Bk. 3
1860    I 9.5: Bk. 3
1870    I 10.5: v. 3
1880    I 11.5: v. 2
1890    I 12.5: Bk. 11-13
1900    I 13.5: v. 7-10

After 1905 they are classified as C 3.XX...

My best,
Tim
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Timothy James Scarlett
Assistant Professor of Archaeology
Program in Industrial History and Archaeology
Department of Social Sciences
Michigan Technological University
1400 Townsend Drive
Houghton, Michigan 49931-1295 USA
Tel (906) 487-2359 Fax (906) 487-2468 Internet [log in to unmask]
MTU Website: http://www.industrialarchaeology.net
SHA Website: http://www.sha.org  SIA Website: http://www.sia-web.org
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"No history can show as these things show, that during the war a hundred
thousand hands armed with these sickles were reaping wheat and rye so as to
make any kind of war possible."
     -Henry Chapman Mercer, 1909.