Large-scale black and white and natural color photographs for the measurement of tree crown areas. 1986. Morton, R.T.; Hall, R.J.; Nesby, R.K.; Sutherland, I. Pages 133-140 in M.D. Thompson and R.J. Brown, editors. Proceedings of the 10th Canadian symposium on remote sensing, May 5-8, 1986, Edmonton, Alberta. Canada Centre for Remote Sensing, Ottawa. 8 p.