Fix the dates

data/text/kamen.xml

@@ -985,7 +985,7 @@
                         The digital edition of Osip Mandelstam's first poetic book "Камень" ("Stone").</head>
                         <p> The book <title>"Камень" ("Stone")</title> is a collection of poems by Osip Mandelstam, 
                             first published in 1913 in St. Petersburg, Russia, by Acme Publishers. It was printed at the author's expense 
-                            and had a print run of 300 copies. The text comprises poems composed by Mandelstam between 1908 and 1915.
+                            and had a print run of 300 copies. The text comprises poems composed by Mandelstam between 1908 and 1913.
                         </p>
                         <p>Following its initial publication, "Камень" underwent several revisions and re-publications. 
                             In 1916, it was re-published with additional poems, retaining the old Russian orthography.