...Although winter aggregations occur in the northern parts of the range, I have never seen such aggregations in the South... 
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Nests are informal aggregations of sticks and litter placed in recesses instumps, hollow trees, rocky and earthen banks, and dwellings and outbuildingsof man...
Richard F. Johnston 「The Breeding Birds of Kansas」
...Nests are informal aggregations of plant and animal fibers in chambers ofearthen burrows usually made by badgers or prairie dogs...
Richard F. Johnston 「The Breeding Birds of Kansas」
...Pairing takes place soon after the breeding aggregations areformed...
Henry S. Fitch 「Field Study of Kansas Ant-Eating Frog」
...They consist of aggregations of peculiar swollen hyphæ, and are termed by Möller the “Kohl-rabi clumps...
Frédéric Houssay 「The Industries of Animals」
...Besides these, there are many othergroups and aggregations of stars which adorn the celestial vault andenhance the beauty of the heavens...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...The larger the mass the greater its attraction, and at last the nodal points become the nuclei of great aggregations from which planets are shaped...
Garrett Serviss 「Curiosities of the Sky」
...At firsthe supposed all nebulæ to be but aggregations of stars...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
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