000000028 001__ 28
000000028 005__ 20160222141710.0
000000028 037__ $$aSIDCimport-31
000000028 100__ $$aKoeckelenbergh, A.
000000028 245__ $$aClassification and Evolution of the Sunspot Groups
000000028 260__ $$c1994
000000028 700__ $$aVan Boxmeer, H.
000000028 773__ $$i5$$pBAB$$v10$$y1994
000000028 905__ $$apublished in
000000028 980__ $$aNONREF