... I had thought of goingback for more, and then it occurred to me that I might profitably givesome of my leisure to the Rooirand... 
John Buchan 「Prester John」
...In many places a bounty is paid on the gopher, so that they may be profitably trapped when fur-bearing animals are of no value...
Elmer Harry Kreps 「Science of Trapping」
...However,ducks can be profitably kept until they are 2 or 3years old, and it is common practice in a farm flockto hold over some of the breeders after they havefinished their first year...
Harry M. Lamon 「Ducks and Geese」
...Enough, however, was done to prove that silkraising can be carried on profitably, when due precautions are taken, asfar north as Boston...
Alpheus Spring Packard 「Our Common Insects」
...The oval niches, the cells that open on those corridors, are also profitably employed...
J. Henri Fabre 「Bramble-bees and Others」
...The time must come ere long when wealth shall outgrow the field inwhich it can be profitably employed...
Simon Newcomb 「Side-lights on Astronomy and Kindred Fields of Popular Science」
...But for the most part they preferred passing in idleness the hours that might have been so profitably spent, straggling into the woods for vegetables, or visiting the French ships in Botany Bay...
David Collins 「An Account of the English Colony in New South Wales, Vol. 1」
...But, notwithstanding the evident necessity that existed for every man's endeavouring to assist himself, very few were observed to be so profitably occupied...
David Collins 「An Account of the English Colony in New South Wales, Vol. 1」
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