Guild Wars 2

I’m just wondering if anyone knows a decent spot to farm these. I need a bunch but I’m having trouble finding a location. I’ve tried grawls in frostgorge and undead in cursed shore but I haven’t gotten lucky there, I get the lower tier bones of those.
Anyone able to shine some light on this for me? Would be much appreciated.

I’m located on Gandara, level 80 and want to start playing in a more organised matter.
Would like to join a laid-back mature guild with a main focus on wvw, but also likes to pve occasionally, dungeon running in particular. To me it’s important that the game is not taken too seriously as in people raging over mistakes or losses.
I am not looking for a guild that does not use voicecomms.

Thanks