Bombs and bombings. Denver 2 letter bombs discovered; one at Post Office, the other at home of Denver Board of Education member Robert L. Grider. Post 0 28, 1973 p.3 PYN 0 28, 1973 p.1 10 false alarms received by police on Oct. 29. Post 0 29, 1973 p.3 Activist lawyer Franke Eugenio Martinez sought in bomb case. Post 0 31, 1973 p.1,4 RMN 0 31, 1973 P.1,5 Secret Witness offers $2,500 for information leading to arrest of Martinez. Post 0 31, 1973 P-1,3