<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META content="text/html; charset=iso-8859-1" http-equiv=Content-Type> <META name=GENERATOR content="MSHTML 8.00.6001.19019"> <STYLE></STYLE> </HEAD> <BODY> <DIV><FONT face="Times New Roman">    I found the source where I think the original paper on this subject is located. It's:</FONT></DIV> <DIV><FONT face="Times New Roman">Linn, Robert M., editor, <EM>Proceedings of the 1<SUP>st</SUP> Conference on Scientific Research in the National Parks</EM> (U. S. Department of the Interior, U. S. Government Printing Office, Washington, DC, 1976, 2 volumes, 1325 pages). I don't recall exactly where in there the paper is, but I'm pretty sure I saw it in there once upon a time.</FONT></DIV> <DIV><FONT face="Times New Roman">Leslie Quinn</FONT></DIV> <DIV><FONT face="Times New Roman"></FONT> </DIV><FONT face="Times New Roman"></FONT></BODY></HTML>