1. Tree heights and upper stem diameters;Ashley;Photogramm. Eng.,1969
2. Forest Measurements;Avery,1983
3. A field test of the accuracy of the Barr and Stroud Type FP-12 optical dendrometer;Bell;For. Chron.,1971
4. Upper stem diameter measurements with the aid of 35 mm photographs;Bradshaw;Aust. Forest Res.,1972
5. More on diameter tape and calipers;Brickell;J. For.,1970