Deterioration in the heating value of coal during storage
By: by Horace C. Porter and F.K. Ovitz
Series: United States. Bureau of Mines. Bulletin -- 136
Publisher: Govt. Print. Off.
Published: 1917
Place of publication: Washington
Language: eng
Number of pages: 38
Subjects: Coal; Testing
Notes: At head of title: ... Department of the interior. Franklin K. Lane, secretary. Bureau of mines. Van H. Manning, director.

First edition. June, 1917. cf. title page verso

"Publications on the composition of coal": pages 35-36