The photo titled "New Guinea Natives Building Bridge Over Markham R. Bulolo 1948" is not over the Markham. The Markham Bridge, which was only recently destroyed, was a Bailey Bridge, not a suspension bridge.
I had Tommy Leahy in my office this morning - Tom, nephew of the early PNG explorers Mick, Jim and Dan Leahy, lived in the Markham from 1948 to 1978. He is sure the suspension bridge is over the Wamput River at the bottom of the Zenag Range. The photo is taken from the Bulolo side, looking north. The Wamput River flows in the Markham River.
The two Bulolo dredge photos are of Dredge No 8. Tom remembers when they were excavating to refloat the dredge.
The "Tenyo Maru" slipped off the reef some years ago during my time in PNG. Two swimmers diving on the wreck were taken there in the 1950's by crocs or sharks.
Tinnie, Pants parked the Baron a bit further out in the Huon Gulf than the Tenyo Maru, but not that far as the splash could be seen from the Lae Tower.