Book  (1907)  Page(s) 135.  
 
1510. LOCK, ALTON; P. moutan.
(1) 1898, The Garden[ing] World, Vol. 14, p. 662.

Website/Catalog  (1899)  Page(s) 16.  
 
Kelway's Single Herbaceous Pæonies.
Alton Locke, maroon. First-class Certificate, R.H.S., 1898.

Magazine  (18 Jun 1898)  Page(s) 662.  
 
Plants Recently Certificated.
Pæony Alton Lock.—This is a rather small-flowered tree Pæony, but the rich deep crimson of its semi-double flowers makes up for the lack of size. Messrs. Kelway & Son.

NB: mis-spelled and mis-classified.

Website/Catalog  (1897)  Page(s) 22.  
 
New Single Herbaceous Pæonies for 1897 (Kelway's). 
Alton Locke, maroon.