Bibliografía (10 obras)
Ten Steps for Recording Pictographs and Petroglyphs
2024
Thunder and herds
2008
Discovering North American Rock Art
2006
Mountain Spirit
Discovering North American rock art
2005
Ancient Visions
2002
Archaeological sites in Welsh Canyon, Las Animas County, Colorado
1999
Visions from canyon walls
1998
New light on old art
1994
The rock art sites in Carbon County, Montana
1985
