Clay industries of New York,

Mode of access: Internet.

Burning clay wares.

Mode of access: Internet.

The British clay worker.

Mode of access: Internet.

1992 census of manufactures.

Mode of access: Internet.

1987 census of manufactures.

Mode of access: Internet.

Year-book for 1907.

Director: H. Foster Bain.

Ceramics /

Mode of access: Internet.

Occupational employment survey booklet of definitions : stone, clay, glass, and concrete products.

"BLS-2877 232."

Soil survey of Clay County, Alabama

"In cooperation with Alabama Department of Agriculture and Industries and Alabama Agricultural Experiment Station."