...The claw marks and other indications were indubitable... 
Stewart Edward White 「African Camp Fires」
...The earliest indubitable man hitherto discovered was fully evolved whenfirst met with, he was homo sapiens...
Peter Nielsen 「The Black Man's Place in South Africa」
...Soon thereafter a Red Cross nurse—FeliciaStuart by name had reported for duty at Paris, having been transferredthither from Italy, and bearing indubitable credentials to that effect...
Albert Payson Terhune 「Bruce」
...But on what object is it intentall this while? for that some design is present here is indubitable...
Rev. C. A. Johns 「British Birds in their Haunts」
...Moreover, it is indubitable that the bean is of earlier date than thepea...
J. H. Fabre Bernard Miall 「Social Life in the Insect World」
...Bacon's lack of the modern scientific instinct must beadmitted, but he rendered humanity a powerful service in directing itfrom books to nature herself, and his genius is indubitable...
Oliver Lodge 「Pioneers of Science」
...Once againhe declared the opinion of Ptolemy true and indubitable and said hedid not hold and had not held this doctrine of Copernicus after he hadbeen informed of the order to abandon it...
Dorothy Stimson 「The gradual acceptance of the Copernican theory of the universe」
...That it is hot beyond all estimate is indubitable...
Henry Warren 「Recreations in Astronomy」
...The divisions and the disputes about opinions are indubitable signs of the uncertainty and of the obscurity of the principles which they profess...
Jean Meslier Anna Knoop 「Superstition In All Ages (1732)」
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