Common Training Manual - Very Rare?

Gravesong
Gravesong Posts: 21 Just Dropped In
Seems like lately (last week or two), the common training manual (Brown) has been almost impossible to acquire (battle cargo/free cargo), while the expert and advanced manuals (Red/Blue) show up more often.

Is this a result of getting into higher levels (15 and up)?  Makes sense if it is, I guess.
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