id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
ap-1880	Jones, Lawrence W.	THE FIRST CENTURY OF COSMIC RAYS, AN HISTORICAL OVERVIEW	2013	3	.pdf	application/pdf	2556	97	51	53 supplement/2013 The First Century of Cosmic Rays, an Historical Overview hydrogen target served as a veto to restrict triggered events to unaccompanied incident cosmic ray particles (virtually all protons). The accelerator–cosmic ray interaction 4 The Echo Lake and Mount Evans research program 5 Recent cosmic ray research References	cache/ap-1880.pdf	txt/ap-1880.txt