333.973
Par
 Parkins, Almen Ernest, 1879-    , ed.
   Our natural reseurces and their conservation, A.E.Parkins [and] J.R. Whitaker editors. Contributers: Wallace W. Atweed, O.E. Baker [and Others] New York, J. Willey, 1936.
   xii, 650 p. ilus., diagrms. 24 cm. 

  ´´Selected bibliography: p. 623-634