Open book with a black background and text on it

Formalin/PFA-fixed paraffin-embedded section of an anti-pfa1 antibody…

Old map of the city of Philadelphia

House with a blue tarp covering its roof

Drawing of a woman with her hands clasped in prayer

Old map of the city of San Francisco

Open book with a drawing of a man on a horse

Piece of paper with handwriting on it and a stamp on the right side

Small pond in the middle of a grassy field