The first morning song of some birds of Washington, DC; Its relation to light

[11] FLAMMARION C, 1893, ANN ASTRONOMIQUE MET

[12] FOLIE F, 1893, ANN OBSERVATOIRE ROY

[13] Hausman L. A., 1925, Auk Lancaster Pa, V42, P320

[14] Kimbal H. H, 1916, MON WEATHER REV, V44, P614

[15] KIMBALL HH, 1916, T ILLUMINATING ENG S, V11, P399

[16] LECOINTE G, 1907, ANN OBSERVATOIRE ROY

[17] MILLER OT, 1897, LITTLE BROTHERS AIR

[18] OLDYS H, 1904, AUK, V21, P270

[19] RHOADS S. N., 1895, AUK, V12, P84

[20] SAUNDERS AA, 1929, HDB NEW YORK STATE M

[11] FLAMMARION C, 1893, ANN ASTRONOMIQUE MET

[12] FOLIE F, 1893, ANN OBSERVATOIRE ROY

[13] Hausman L. A., 1925, Auk Lancaster Pa, V42, P320

[14] Kimbal H. H, 1916, MON WEATHER REV, V44, P614

[15] KIMBALL HH, 1916, T ILLUMINATING ENG S, V11, P399

[16] LECOINTE G, 1907, ANN OBSERVATOIRE ROY

[17] MILLER OT, 1897, LITTLE BROTHERS AIR

[18] OLDYS H, 1904, AUK, V21, P270

[19] RHOADS S. N., 1895, AUK, V12, P84

[20] SAUNDERS AA, 1929, HDB NEW YORK STATE M