<HEAD> <TITLE>" Nitrogen and Phosphorus Cycles Late 1970's"</Title> </HEAD> <BODY> <A NAME="pgtop"></A> <A HREF="nrelc.html"><Img Src="flconts.gif"></A> <A HREF="nrel14.html"><Img Src="fllarrow.gif"></A> <A HREF="nrel16.html"><Img Src="flrarrow.gif"></A> <A HREF="mailto:bobw@nrel.colostate.edu"><Img Src="flmlsend.gif"></A> <BR> <IMG BORDER=0 SRC="nrel15.gif" > <HR> <A NAME="pgbot"></A> <BR> <ADDRESS>Bob Woodmansee <A HREF="mailto:bobw@nrel.colostate.edu">bobw@nrel.colostate.edu</A></ADDRESS> <FONT SIZE="-2">Published by Lotus® Freelance Graphics® </BODY>