by: Admin_LouisPosted on: Which year did petroleum oil was discovered Which year did petroleum oil was discovered90’s80’s—>> 70’s60’s Share this:TwitterFacebookLike this:Like Loading... Related posts:Fishing is a pre-historic peactic dated back _______Early Neolithic pottery wase found in the following country expectWhich year did the International Technical Workshop on Indicators Relevant for Indigenous Peoples was held inIn the _______ sweetgrass baskets began to evolve from agricultural tools to household items