1389 20160222141727.0 SIDCimport-1673 Clette, F. 2010 2010-10-xx Revisiting sunspot catalogs: Data merging and index construction STCE Lefèvre, L. Baranyi, T. Ludmany, A. Soteria General Meeting, Debrecen, 7/10/2010 Contributed CTALKCONT