Derek Bristol Posts - TopicsExpress

Joe Mitchell showed his third prototype Caveatron 3D modelling
Joe Mitchell showed his third prototype Caveatron 3D modelling device today at the Texas Speleological Survey meeting today. This device like others c...

Theres a special place in Hell for surveyors who dont sketch to
Theres a special place in Hell for surveyors who dont sketch to scale. Three different surveys come together in the same room. There were two differen...