http://www.starbreeder.org/certificate/Alvin_W_Zimmerman_Star_Breeder_Certificate.html

http://www.starbreeder.org/certificate/Amos_M_Zimmerman_Star_Breeder_Certificate.html

http://www.starbreeder.org/certificate/Marlin_Zimmerman_Star_Breeder_Certificate.html

http://www.starbreeder.org/certificate/John_E_Zook_Star_Breeder_Certificate.html

http://www.starbreeder.org/certificate/Amos_M_Zimmerman_East_Earl_PA.html