...David Coward, whose editions of the D’Artagnan Romances have proved an invaluable source of information... 
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...As a watchman he is invaluable, as a second captain or fundi, whose duty it is to bring up stragglers, he is superexcellent...
Henry M. Stanley 「How I Found Livingstone」
...I hadall I could do to get through it, though assisted by my invaluable Bakwiristaff...
Mary H. Kingsley 「Travels in West Africa」
...Jones was well cared for by the Vigilance Committee and sent on his way rejoicing, feeling that Resolution, Underground Rail Road, and Liberty were invaluable...
William Still 「The Underground Railroad」
...One of the invaluable compensations of the late Rebellion is the highlyinstructive disclosure it made of the true source of danger to republicangovernment...
Frederick Douglass 「Collected Articles of Frederick Douglass」
...Histestimony is invaluable as an endorsement of Mr...
Henry Bibb 「Narrative of the Life and Adventures of Henry Bibb, an American Slave, Written by Himself」
... It is a tonic, the exhilarating effect of which is invaluable...
Various 「Ainslee's, Vol. 15, No. 6, July 1905」
...In the forest, Turkish banditsrob him of his invaluable horse while he sleeps; hethen sets out, alone and sad, towards the city of Semengam,following the track left by his horse...
Angelo de Gubernatis 「Zoological Mythology, Volume I (of 2)」
...I am grateful to my wife, Janis, for her invaluable assistance and for typing the manuscript...
Ray D. Burkett 「Natural History of Cottonmouth Moccasin, Agkistrodon piscovorus (Reptilia)」
...Hard as iron, tireless andfearless, he has been an invaluable assistant inall that pertains to Park protection...
Various 「Hunting in Many Lands」
...
Beat, good, difficult but invaluable,
Beef-tea, how to make, ...
Dinks, Mayhew, and Hutchinson 「The Dog」
..."This breed provides a favourite 'house dog'; they have proved invaluable as Army Medical Service dogs, and are friendly with children...
Henny Kindermann Agnes Blake 「Lola」
...new, original and invaluable to thebeginner ...
Douglas Dewar 「A Bird Calendar for Northern India」
...Waffles would have been an invaluable customer to Thornton if the former'sgroom, Mr...
R. S. Surtees 「Mr. Sponge's Sporting Tour」
...'Yes, sir! here, sir!' exclaimed that invaluable servant, tidying herpink-ribboned cap as she hurried into the passage below...
R. S. Surtees 「Mr. Sponge's Sporting Tour」
...They worked hard now collecting the lovely birds that abounded in the forest, and the gloriously tinted beetles and butterflies, Coffee and Chicory having by this time grown invaluable as collectors...
George Manville Fenn 「Off to the Wilds」
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