. . "Technical research ship" . . "research ship" . . "Technical Research Ship" . . . "research" . . . . . "Technical research ship" . . "USS ''Oxford'' (AGTR-1)" . . "ship" . "Technical research ship#Auxiliary General (AG) USNS ships" . . "Environmental Research Ships" . . "Instrumentation ship" . "environmental research ships" . . "technical research ship" . . . "AGTR" .