Circular - University of Illinois, Engineering Experiment Station.

Mode of access: Internet.

Investment of steam railways in highway motor vehicle enterprises as of May 1, 1936. Summary of returns on Statistical series circular no. 22.

Published by the Bureau under its earlier name: Bureau of Statistics.

Special circular - Ohio Agricultural Experiment Station.

Mode of access: Internet.

Research circular - Ohio Agricultural Research and Development Center.

Each issue has a distinctive title.

The visual (grating and glass lens) solar spectrum in 1884 /

"From the Transactions of the Royal Society of Edinburgh, vol. XXXII, pt. III."

Investigation of centrifugal pumps : Part II, Experiments with a six inch horizontal centrifugal pump, comparing the efficiency of circular and spiral cases and showing the effect of air leakage

Mode of access: Internet.

Nociones de geografía descriptiva : precedidas de un ligero resúmen de la astronómica y la física : dispuestas con arreglo a lo que ordena la real orden circular de 22 de agosto de 1864... /

Mode of access: Internet.

Memoria histórica de la Compañia general de Comercio de los cinco Gremios mayores de Madrid : mandada presentar al Ministerio de Fomento por su Real Orden circular de 17 de Diciembre de 1832.

Mode of access: Internet.

Norton's literary gazette and publishers' circular.

Mode of access: Internet.