O. T. Helgerson has written:
'Thinning young Douglas-fir west of the Cacades for timber and wildlife' -- subject(s): Forest thinning, Thinning, Douglas fir
Ole T. Helgerson has written: 'Survival of natural and planted seedlings under a shelterwood in southwest Oregon' -- subject(s): Growth, Conifers, Trees, Seedlings
T. O. Newnham has written: 'South Indian village'
O. K. T. has written: 'San Pek Eng Tay'
T. O. Garland has written: 'Tuberculosis in Newfoundland' -- subject(s): Tuberculosis
N. T. Leroy has written: 'O magala'
T. O. Friz has written: 'What's available from United States Geological Survey'
Y. T. O. has written: 'Aristophanes at Oxford, O.W' -- subject(s): Drama
T. O. Achelis has written: 'Matrikel der schleswigschen Studenten 1517-1864'
T. S. Mal'tsev has written: 'Razdum'ya o zemle, o khlebe' 'Voprosy zemledeliya'
O. T. B. Williams has written: 'Seward County, its description, resources and advantages..'
O. P. T. Kantorowicz has written: 'On steam turbine wheel, batch and blade vibrations'
T. O. McCartney has written: 'Precision perspective drawing' -- subject(s): Mechanical drawing, Perspective