These numbers are from the 2001-2002 Idea Book & Catalog:
5430 00 = Soft Subtles assorted 8.5" x 11"
5430 56 = Mellow Moss 8.5" x 11"
5420 46 = Brilliant Blue 8.5" x 11"
5430 50 = Perfect Plum 8.5" x 11"
5410 00 = Rich Regals assorted 8.5" x 11"
5420 32 = Yoyo Yellow 8.5" x 11"
5420 35 = Real Red 8.5" x 11"
5441 00 = Ultrasmooth Vanilla 8.5" x 11"
5440 00 = Earth Elements assorted 8.5" x 11"
5420 00 = Bold Brights assorted 8.5" x 11"
These numbers are taken from the 2003-2004 Idea Book & Catalog:
101847 = Bold Brights assorted 8.5" x 11"
101650 = Ultrasmooth Vanilla 8.5" x 11"
I couldn't find 103599. I did find 10
2599, which is Glossy White 8.5" x 11".
I hope this helps!