The baltic birch I special ordered at Menards at $75 a 4'x8' sheet, description states that all plies are baltic birch.
Description from Menards website:
"The face and inner plies of this 3/4" x 4' x 8' Baltic Birch Plywood are all equal in thickness for more stability. This plywood features an extra-thick sanded face veneer.
Extra-thick sanded face veneer
All plies are high-quality, high-density Baltic birch
Dimensions: 3/4" x 4' x 8'
Shipping Dimensions: 96.0 x 48.0 x 0.75
Shipping Weight: 83.0 lbs"