Injury experience in coal mining, 1951

Reese, S.T. / Wrenn, V.E. / Reid, E.J. | Engineering Index Backfile | 1955

Injury experience in coal mining, 1952

Reese, S.T. / Wrenn, V.A. / Reid, E.J. | Engineering Index Backfile | 1955

Injury experience in coal mining, 1957

Machisak, J.C. / Wrenn, V.E. / Jones, N.L. et al. | Engineering Index Backfile | 1960

Injury experience in quarrying, 1959

Glidden, Z.S. / Wrenn, V.E. / Machisak, J.C. et al. | Engineering Index Backfile | 1963

Injury experience in coal mining, 1962

Moyer, F.T. / Jones, N.L. / McNair, M.B. et al. | Engineering Index Backfile | 1964