Easter 1975 was held on Sunday March 30th. On that date I was hiking south on the AT and did 18 miles arriving at Outerbridge LT at 430 PM. I don't have a picture of this LT, but you can see one here. And another here.
I wrote in my journal... "Great spring here a (sic) shelter last time I saw anything like this was in N.H. or Maine. Snowed a little at nite."
"Left Leroy Smith LT at 8:30 am." I think this shelter has been replaced since 1975.
Crossed Lehigh Gap that day shown on this topo from the period/
and an airphoto from 1976.