1. Spectrochemical Analysis;Ahrens,1961
2. A petrographic and petrologic study of some chemical sediments;Alexander;J. Sediment. Petrol.,1934
3. Initial shape and roundness of sedimentary rock mineral particles of sand size;Alling;J. Sediment. Petrol.,1950
4. Foundry Sands and Mold Materials.;American Foundrymen's Association,1945
5. Standard Procedure for Determining Permeability of Porous Media.;American Petroleum Institute,1952