...A light sandy or gravelly soil is to be preferred,and a clay soil should be avoided... 
John H. Robinson 「Our Domestic Birds」
...Eggs are laid on the ground in rocky or gravelly areas, on unpavedroads, or on flat, gravelled tops of buildings of man...
Richard F. Johnston 「The Breeding Birds of Kansas」
...Most of them are pegged out on thesummit of a gravelly ridge, wooden pegs being driven with a rock throughslits in the edges of the skin ()...
Francis Harper 「The Barren Ground Caribou of Keewatin」
...The soil of the rather level sageland in most places is rockyor gravelly, or, as adjacent to washes, it is finely sandy in texture, andsupports the major plants of the association...
Terry A. Vaughan 「Mammals of the San Gabriel Mountains of California」
...surrounded by rocky slopes," whereas these pocket mice in theSan Gabriels inhabited gravelly or rocky juniper-dotted benches...
Terry A. Vaughan 「Mammals of the San Gabriel Mountains of California」
...Itoccurred on the sandy ground of desert washes, the gravelly soil ofthe juniper-clad benches, and the mixed sandy and rocky ground ofwashes in canyons...
Terry A. Vaughan 「Mammals of the San Gabriel Mountains of California」
...The yellow, gravelly sand was heaping on both sides, andthe shoulders of the sturdy digger were sinking below the level...
Ernest Seton-Thompson 「Lobo, Rag and Vixen」
...The orangethroat darter was less restricted in habitat than thejohnny darter, occurring in all stream-types, but most often in theriffles of gravelly streams...
W. L. Minckley 「Fishes of the Big Blue River Basin, Kansas」
...nigrum were locally common inmuddy streams, but the first two were most frequent in larger,sandy streams, and the last three in gravelly streams...
W. L. Minckley 「Fishes of the Big Blue River Basin, Kansas」
...These species require comparatively permanent streams having pool-and-riffle habitats and gravelly bottoms for spawning...
James E. Deacon 「Fishes of the Wakarusa River in Kansas」
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