(i), (v), (vii)-(x) the Time Patrol series.
(ii) The Golden Slave.
(iii), (iv), (xi), (xii) The King Of Ys.
(vi) "The Peat Bog."
(xiii) The Last Viking.
(xiv) The Boat Of A Million Years.
(xv) There Will Be Time.
(xvi) Rogue Sword.
(xvii) The History of Technic Civilization.
The addition proposed by Sean Brooks in the combox relates to The King Of Ys.
Also, Poul Anderson's Psychotechnic History begins with "Marius," which recounts the assassination of a military leader to prevent him from becoming another Marius, i.e., a good general but a bad politician.