Denver. Concessions City waives $13,0000 in Johancen case. (Concessions City Auditorium and Denver Coliseum) News S 20 "5-5,P-32 Study underway to set up new concessions standards for city. 1955 p,32 Nicholson plans to qualify city lessees on 'background'. Post j 26 '55 p.43- New prodedure wed for city concessions. News N 23 1,5 p.12 Denver seeks competition bids on taxi service at Stapleton yield. News l1 30 'S5 p.67 0