CREATE TABLE table_23448 ("Index  ( Year ) " TEXT, "Author / Editor / Source" TEXT, "Year of publication" TEXT, "Countries sampled" FLOAT, "World Ranking  ( 1 ) " TEXT, "Ranking L.A.  ( 2 ) " TEXT)

What was the publication year ranking l.a. is 1st?
SELECT "Year of publication" FROM table_23448 WHERE "Ranking L.A. (2)" = '1st'
SELECT "Year of publication" FROM "table_23448" WHERE "Ranking L.A. (2)" = '1st'