1 daughter colonies of the 4a were tested:
CH-51-7-1808-1983
1 tested queens were mated at the mating station:
CH-51-7-2093-1986
3 daughter colonies of queens mated at the mating station were tested:
CH-51-7-2100-1986 CH-51-7-2528-1986 CH-51-7-2634-1987