Ferguson, CW, and DA Graybill. 1985. ?Dendrochronology Of Bristlecone Pine?. Tucson: Laboratory of Tree-Ring Research.

Graybill, DA. 1985. ?Proposed Contract With The Environmental Sciences Division, Oak Ridge, Tn. 37831 For Research On 'detection Of Forest Response To Increased Atmospheric Carbon Dioxide' 1985?. Tucson: Laboratory of Tree-Ring Research.

Graybill, DA. 1985. ?Western U.s. Tree-Ring Index Chronology Data For Detection Of Arboreal Response To Increasing Carbon Dioxide?. Tucson: Laboratory of Tree-Ring Research.

Graybill, DA. 1984. ?Proposed Contract With The Environmental Sciences Division, Oak Ridge, Tn. 37831 For Research On 'detection Of Forest Response To Increased Atmospheric Carbon Dioxide' 1984?. Tucson: Laboratory of Tree-Ring Research.