...The coil and spiral are freelyused as the groundwork, and the colours alternatedas the coils or spirals change from front toback of the leaf... 
John W. Bradley 「Illuminated Manuscripts」
...Like Virgil, he first sketched out his work in prose, and onthis groundwork elaborated the charms of colouring and harmony whichdistinguish the poem...
Hugh Macmillan 「Roman Mosaics」
...It is the groundwork upon which we havestill to build...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
..."The author has worked skilfully into his book details of the factsand inferences which form the groundwork of modern Botany...
Cecil G. Dolmage 「Astronomy of To-day」
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