On Dec 4, 9:32*am, garage woodworker wrote:
My son wants a no-frame bookcase 14" x 39.5" x 52.75" from either 5/8" 11
ply Baltic Birch Plywood or 3/4" 13 ply Baltic Birch Plywood. Will 5/8"
really hold up? I have my doubts.

For uprights, 5/8" is more than enough; I've got 1/2" plywood holding
fine on seven-foot shelf units from decades gone by.
For a shelf 39" wide, though, use solid wood, or some kind of
frontedge/backedge stiffener (like, 2" oak, tongue-groove and glue)
that's deeper than 5/8 or 3/4".

Was there a plan to cover the plywood edges? Or to apply a finish?