WERE SOME DINOSAURS GREGARIOUS

[1] Albritton C. C. Jr., 1942, Field & Laboratory Dallas, V10, P161

[2] [Anonymous], 1845, P 6 ANN M ASS AM GEO

[3] BAKKER R T, 1968, Discovery (New Haven), V3, P11

[4] Bird R. T., 1941, Natural History New York, V47, P75

[5] CALKIN JB, 1933, DISCOVERY LONDON, V14, P13

[6] CHARIG AJ, 1962, NEW SCI, V14, P234

[7] HITCHCOCK E, 1958, ICHNOLOGY NEW ENGLAN

[8] HITCHCOCK EH, 1843, 1 2 3 M ASS AM GEOL, P254

[9] Lull R.S., 1953, CONNECTICUT STATE GE, V81, P1

[10] Lull RS., 1904, MEMOIRS BOSTON SOC N, V5, P461

[1] Albritton C. C. Jr., 1942, Field & Laboratory Dallas, V10, P161

[2] [Anonymous], 1845, P 6 ANN M ASS AM GEO

[3] BAKKER R T, 1968, Discovery (New Haven), V3, P11

[4] Bird R. T., 1941, Natural History New York, V47, P75

[5] CALKIN JB, 1933, DISCOVERY LONDON, V14, P13

[6] CHARIG AJ, 1962, NEW SCI, V14, P234

[7] HITCHCOCK E, 1958, ICHNOLOGY NEW ENGLAN

[8] HITCHCOCK EH, 1843, 1 2 3 M ASS AM GEOL, P254

[9] Lull R.S., 1953, CONNECTICUT STATE GE, V81, P1

[10] Lull RS., 1904, MEMOIRS BOSTON SOC N, V5, P461