Solomon's Treasure SOURCEBOOK - Book - Page 107
THE SEARCH FOR KING SOLOMON’S TREASURE SOURCEBOOK
105
91
92
93
91. Science in the Philippines. A review by James J. Walsh, Ih.D., M.D. Walsh, James Joseph, 1865-1942. The United States
and its Territories. 1870-1925: The Age of Imperialism. Manila (Philippines), Manila Harbor Board., Philippines. Manila Arrastre Service., Philippines. Bureau of Customs. P.8. https://quod.lib.umich.edu/p/philamer/AHZ9181.0001.001?rgn=main;view=fulltext
92. Wikipedia citing Valera, R.G.; Valera, P.G. (2003), “Tin in the Mediterranean area: history and geology”, in Giumlia-Mair,
A.; Lo Schiavo, F. (eds.), The Problem of Early Tin, Oxford: Archaeopress, pp. 3–14.
https://en.wikipedia.org/wiki/Tin_sources_and_trade_in_ancient_times
93. “Tin Mining in Mindanao.” World Encyclopedia 2005, originally published by Oxford University Press 2005., The Columbia
Encyclopedia, 6th ed. https://www.encyclopedia.com/places/asia/philippines-political-geography/mindanao
Also, The American Desk Encyclopedia. Edited by Steve Luck. Oxford University Press 1998. P. 533. https://books.google.com.ph/
books?id=o8MdoOd6pOcC&pg=PA533&lpg=PA533&dq=tin+mining+Mindanao+World+Encyclopedia&source=bl&ots=oMQxAUWsZZ&sig=ACfU3U39qGdHpNFh0HEAYjJEBVxWLCuQ2A&hl=en&sa=X&ved=2ahUKEwjR3a6gw_bnAhWU7GEKHRtrBIUQ6AEwEHoECAkQAQ#v=onepage&q=tin%20mining%20
Mindanao%20World%20Encyclopedia&f=false