div class=ts-pagebuttonPage 1button div class=ts-image amp-img class=ts-thumb alt=Page 1: truss poster - NPSgov Homepage US National Park … posterpdf · TRUSSES UPPER CHORDS OF z EM 77 PONY TRUSS ROOF TRUSSES pRATT OA 40UL5 W TEV5ow HOWE truss postertif src=https:reader034vdocumentsmxreader034viewer20220522085a7a7bdf7f8b9a8d558bffaahtml5thumbnails1jpg width=142 height=106 layout=responsive amp-img divdiv