florida. that's all tomorrow night at 6:00 eastern on our companion network, c-span. the c-span cities tour, working with our cable affiliates and visiting cities across the country. this weekend we're joined by charter communications to learn more about the history and life of grand junction, colorado. mining had a certain importance in this part of colorado. >> all over the colorado plateau and outside of grand junction we are surrounded by morrison wrong. and -- rock. and we find a lot of dinosaur bones and fossils. the other thing we find is a rock called karnetite. it contains ven aid yum, which

is used to strengthen steel. so during the buildup to world war ii and during world war ii itself, ven aid yum was of extreme value. and it also contains uranium. >> colorado congressman wayne as pin all was widely credited. >> he made sure that we got our fair share. how did he do that? well, beginning in his state career and then going on to his federal career, he climbed up the ladder of seniority and was able to exercise, i think, more power than you might normally have. certainly, in the united states congress where he was able to

make sure colorado and western colorado would be treated fairly in any divisions of water. his first major success was the passage of the colorado river storage project in 1956. >> see all of our programs from grand junction saturday on c-span, and sunday afternoon at 2:00 on c-span 3. 70 years ago, american forces dropped two bombs in japan, one in hiroshima and one in nagasaki. up next, we hear about the manhattan project to build an atomic weapon. he served as an assistant to leslie droves. he recalls going behind european enemy lines to determine nazi germany's atomic bomb

capabilities. robert furman died in october 2008 at the age of 93. this 90-minute oral history is from the voices of