Ole T. Helgerson has written: 'Survival of natural and planted seedlings under a shelterwood in southwest Oregon' -- subject(s): Growth, Conifers, Trees, Seedlings
O. T. Helgerson has written: 'Thinning young Douglas-fir west of the Cacades for timber and wildlife' -- subject(s): Forest thinning, Thinning, Douglas fir
Richard Fromme has written: 'Richard Wagner'
Richard Dominique has written: '\\'
Richard Madin has written: 'Microtutor'
Richard Mullins has written: 'Swimmer'
Richard A. Firmage has written: 'Alphabet'
Philippe Richard has written: 'Ethnophoto'
Richard Hatcluyt has written: 'Voyages'
Richard Bunworth has written: 'Homotropia'
Richard Murray has written: 'Alethia'
Richard Janno has written: 'Metsmees'