Howland, Type 39' Cistern Howland, Type 40 A Well Howland, Type 40 B Howland, Type 41 Howland, Type 42 A Howland, Type 42 B Pit Pyre Howland, Type 42 C
Howland, Type 50 A Cistern Howland, Type 50 B Well Howland, Type 50 C Howland, Type 50 D Howland, Type 51 A Fill Howland, Type 51 B Pit Howland, Type 51 C