"bucket" mod copyrights, licenses, and/or credits
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Lava Crust bucket media:
(c) 2011-2019 and CC BY-SA 3.0: Cisoun, ElementW, and Poikilos.

Original source code:
Kahrl <kahrl@gmx.net> (LGPL 2.1)
celeron55, Perttu Ahola <celeron55@gmail.com> (LGPL 2.1)
Various Minetest developers and contributors (LGPL 2.1)

Bucket media except as noted above:
(c) 2011-2019 and CC BY-SA 3.0: ElementW.