It's "The West's Most Comprehensive Record List (Now In Its 9th Year)" from KSAN (1450 AM) in San Francisco — "The Home of the Big Beat" — for the month of April 1960, and comprehensive it is. With separate listings for Top Ten Pops, Ballads, Blues (Down Home), Vocal Groups, Instrumentals, Rhythm & Blues and Rock & Roll, plus a pair of "Contenders," this KSAN compendium runs the gamut from B.B. King to Brenda Lee.
Note that this is only the front side of the survey; a copy of the reverse has not been located.
SOURCE: Survey image from the David Billeci Collection of the Bay Area Radio Museum.