Dual Blade Skill Book Location

If there's a topic that has all of this, sorry for the inconvenience of closing this one.

Note 1: The monster book data says the books only drop from the green transforming snail which seems to be the hob pq boss. This isn't 100% true

Note 2: This deals with books not from the cash shop so not everyone has to pay NX

Slash Storm 20 -

Tornado Spin 20 -

Mirror Image 30 - Memory Monks

Flying Assaulter 20 - Skeles

Sudden Raid 30 -

Thorns 30 - Horntail?

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Non-CS Books

Final Cut 10 - Zakum

Chains of Hell 10 - Zakum

Venom 30 -

Monster Bomb 30 - Chief Qualm Guardian

Mirrored Target 30 -