Two Definitive Collections

I suppose that Time Patrol and The Earth Book Of Stormgate are two definitive single-volume Poul Anderson collections. The Technic Civilization Saga counts perhaps as a seven-volume collection.

Time Patrol collects the whole Time Patrol series except for the long novel, The Shield Of Time, to which it is a companion volume.

The front cover blurb of The Earth Book Of Stormgate (New York, 1979) reasonably accurately proclaims that this book: 

"Spans, illuminates and completes the magnificent future history of the Polesotechnic League" 

The Earth Book collects half of the twenty four pre-Flandry installments of the Technic History while its new introductions are fictitiously written as if during the early Terran Empire, albeit still pre-Flandry. No single-volume collection could be more comprehensive.

The two collections are also complementary, covering past and future history respectively although of alternative timelines.