Just going to TGC and putting "aspect" in the site search got me this:
http://www.guildcompanion.com/scrolls/2007/apr/spellbookdumarion.html
http://www.guildcompanion.com/scrolls/2007/dec/tomepartone.html
http://www.guildcompanion.com/scrolls/2008/jan/tomeparttwo.html
http://www.guildcompanion.com/scrolls/2004/nov/greaterrituals.html
http://www.guildcompanion.com/scrolls/2004/jul/newharpprofession-dabbler.html
That should at least get you started. Site search at TGC isn't a box in the header, it's a menu option, not sure why.