Columbia subject headings:
Fen âlemi.
Science--Popular works--Periodicals--History.
Science--Turkey--Periodicals--History.
Harvard subject headings:
Fen âlemi.
Science--Popular works--Periodicals--History.
Science--Turkey--Periodicals--History.
Princeton subject headings:
Fen âlemi.
Science--Popular works--Periodicals--History.
Science--Turkey--Periodicals--History.