Columbia subject headings:
Fechner, Gustav Theodor, 1801-1887--Congresses.
Psychology, Experimental--Congresses.
Psychophysics--Congresses.
Science--Philosophy--Congresses.
Harvard subject headings:
Fechner, Gustav Theodor, 1801-1887--Congresses.
Psychology, Experimental--Congresses.
Psychophysics--Congresses.
Science--Philosophy--Congresses
Princeton subject headings:
Fechner, Gustav Theodor, 1801-1887--Congresses.
Psychology, Experimental--Congresses.
Psychophysics--Congresses.
Science--Philosophy--Congresses.