...The groundwork was the natural color of the clay, which had been plastered upon the wall of wicker-work... 
Horatio Bridge 「Journal of an African Cruiser」
...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」
...However this may be, the fact remains that it is from groundwork that future investigators must build...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
...It is the groundwork upon which we havestill to build...
Edward Singleton Holden 「Sir William Herschel: His Life and Works」
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