A low-tech technique for aerial photograph analysis. Frey, T. C. & Curtin, C. G. Bulletin of the Ecological Society of America, 1997.
bibtex   
@article{frey_low-tech_1997,
	title = {A low-tech technique for aerial photograph analysis},
	volume = {78},
	journal = {Bulletin of the Ecological Society of America},
	author = {Frey, Timothy C. and Curtin, Charles G.},
	year = {1997},
	keywords = {SEV}
}

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