Scales and Modes- Part 2 (as Part 1 but in the Bass clef) is the second book in a series of straight forward musical information for online reading/ reminding/ helping.
Each page has examples of Major and Natural Minor scales, (Aeolian), Dorian, Mixolydian and Lydian modes (with the same key signature) all in the Bass clef. 
The Scales and Modes can be used for practicing an instrument, music theory reminders, understanding musical relationships (improvising, composing) and just having fun with.