John Rusk:
P20131219-0009—Populus tremuloides (B&W)—RPBG-1
John Rusk:
N20141222-0063—Populus tremuloides—RPBG
John Rusk:
E20160713-0003—Populus tremuloides
John Rusk:
J20180125-0050—Populus fremontii ssp fremonti—RPBGi—DxO