APA (7th ed.) Citation

(1926). Rock dust material for coal mines. [publisher not identified].

Chicago Style (17th ed.) Citation

Rock Dust Material for Coal Mines. Washington, D.C.: [publisher not identified], 1926.

MLA (9th ed.) Citation

Rock Dust Material for Coal Mines. [publisher not identified], 1926.

Warning: These citations may not always be 100% accurate.