This is the third bout of doubt I've had in the la

This is the third bout of doubt I've had in the last month. If I could just find 1 reference to any of the info available I'd be happy. I did get a better handle on where they are located see link below. I'll let everyone know if I find anything helpful. As always glte

https://www.msu.edu/~simmo108/World_Development_Simmons.pdf