Peat in 1922 :
Cottrell, K. W.
Peat in 1922 : Mineral resources of the United States, 1922-Part II. - Washington, D. C. Goternment printing office 1923 - pp. 5-6
Impreso
Ingles
MINERALES MINERIA TURBA
Peat in 1922 : Mineral resources of the United States, 1922-Part II. - Washington, D. C. Goternment printing office 1923 - pp. 5-6
Impreso
Ingles
MINERALES MINERIA TURBA