TY  - BOOK
AU  - Dale,T.Nelson
AU  - Hillebrand,W.F.
AU  - Eckel,Edwin C.
AU  - Coons,Altha Titsworth
TI  - Slate in the United States,
T2  - U. S. Geological survey. Bulletin
AV  - QE75 .B9 no. 586
PY  - 1914///
CY  - Washington
PB  - Govt. print. off.
KW  - Slate
N1  - Many plates printed on both sides of leaves; "The present bulletin is not only a corrected and revised ed. of bulletin 275, but contains also the results of ... recent discoveries and studies."; "Bibliography of slate": p. 205-213
ER  -