Bonding in eight ordered clinopyroxenes isostructural with diopside
J. R. Clark, D.E. Appleman, J. J. Papike
1968, Contributions to Mineralogy and Petrology (20) 81-85
Bond distances and angles in isostructural, ordered clinopyroxenes are compared for eight compositions, based on five new and three published crystal-structure refinements from X-ray diffraction data. Unit-cell parameters and configuration of the silicate chains are directly correlated with cation composition and distribution in the M2 and M1 sites. ...
Van vleck paramagnetism in orthorhombic TiO2 (Brookite)
F. E. Senftle, A. N. Thorpe
1968, Physical Review (175) 1144-1146
The magnetic susceptibility of the orthorhombic form of titanium dioxide has been measured from 5 to 300°K. After deducting the temperature-dependent component, which is probably due to defects or impurities, and the free-ion diamagnetic component, the Van Vleck paramagnetism was estimated to be 33×<span...
Crystal Structure of Veatchite
J. R. Clark, C. L. Christ
1968, Die Naturwissenschaften (55) 648
[No abstract available]...
Palaeomagnetism, Potassium-argon ages and petrology of some volcanic rocks
G. B. Dalrymple, A. Cox
1968, Nature (217) 323-326
Geological evidence obtained from samples of rocks from Cocos Island, Costa Rica, seems to agree with the idea that this island could have been a stepping stone for organisms migrating to the Galapagos Islands. ...
The changing seasons--the 1968 spring migration
R. Andrews
1968, Audubon Field Notes (22) 502-504
[Letter to the Editor] Kites in the Everglades
P.W. Sykes Jr., W. B. Robertson
1968, Nature (220) 939-940
Slate-colored junco recovery from Michigan
W.T. Van Velzen
1968, Maryland Birdlife (24) 82
Nest records of the brown thrasher in Maryland
W.T. Van Velzen
1968, Maryland Birdlife (24) 3-9
[Book review] McClung, Robert. Redbird: The Story of a Cardinal. William Morrow. 1968. Pp. 00. Illus
Richard C. Banks
1968, Atlantic Naturalist (23) 126
[Book review] 'Hawaii's birds,' by Hawaii Audubon Society
C. B. Kepler
1968, The Wilson Bulletin (80) 511
[Book review] Hindwood, Keith. Australian Birds in Color. East-West Center Press. Honolulu. 1966. Pp. 112
Richard C. Banks
1968, Atlantic Naturalist (23) 122
[Book review] Reilly, Edgar M., Jr. The Audubon Illustrated Handbook of American Birds. McGraw-Hill. 1968. Illus. Pp. 524
Richard C. Banks
1968, Atlantic Naturalist (23) 226-227
Sixty-eighth Christmas bird count. 272. Southern Dorchester County, Md
D. R. Clark Jr.
1968, Audubon Field Notes (22) 187-188
[Book review] Hanzak, J. The Pictorial Encyclopedia of Birds. Edited by Bruce Campbell, American Consultant Ned R. Boyajian. Crown. 1967. 582 pp., 1,075 photographs, 45 color photos
Richard C. Banks
1968, Atlantic Naturalist (23) 167-169
Report of the state-wide bird count, May 4, 1968
W.T. Van Velzen
1968, Maryland Birdlife (24) 35-43
[Book review] Radar Ornithology, by Eric Eastwood
C.S. Robbins
1968, Atlantic Naturalist (23) 234-235
Collecting and rearing black flies
I.B. Tarshis
1968, Annals of the Entomological Society of America (61) 1072-1083
This paper, based on a study carried out at the Seney National Wildlife Refuge, Seney, Michigan, and the Patuxent Wildlife Research Center, Laurel, Maryland, describes methods and techniques for collecting, storing, and rearing 8 species of Simuliidae. Included in the study were Cnephia dacotensis (Dyar & Shannon), C. mutata (Malloch), Prosimulium fuscum Syme & Davies, Simulium aureum Fries, S....
The season - July, August, September, 1968
C.S. Robbins
1968, Maryland Birdlife (24) 102-108
Use of fabrics in streams to collect black fly larvae
I.B. Tarshis
1968, Annals of the Entomological Society of America (61) 960-961
A technique is described for using strips of gauze to collect large numbers of larvae of Cnephia dacotensis (Dyar & Shannon), Simulium decorum (Walker), S. venustuni Say, S. vcrecundum Stone & Jamnback, and S. vittatum Zetterstedt from various water habitats....
Migration of a downy woodpecker
W.T. Van Velzen
1968, Maryland Birdlife (24) 115
Vegetation used for nesting by the red-winged blackbird in Florida
J.F. Stowers, D.T. Harke, A.R. Stickley
1968, The Wilson Bulletin (80) 320-324
During the breeding season of 1966, as an adjunct to a taxonomic study of Red-winged Blackbirds in Florida, 177 Redwin g nests were found. The general habitat types were noted, and the plant species harboring nests were listed.....Redwing nests were found in 30 genera of plants. Buttonbush was the primary...
Sixty-eighth Christmas bird count. 276. Back Bay National Wildlife Refuge, Va
P.W. Sykes Jr.
1968, Audubon Field Notes (22) 189-190
Black-throated sparrow in Kiowa County, Oklahoma
W.T. Van Velzen
1968, Bulletin of the Oklahoma Ornithological Society (1) 26
The season - January, February, March, 1968
C.S. Robbins
1968, Maryland Birdlife (24) 44-47
The season - April, May, June, 1968
C.S. Robbins
1968, Maryland Birdlife (24) 73-79