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items:
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sign7 to sign17: 
These were items that were in the 1.7.10 versions of custom npcs which I needed for this adventure map (THEY ARE STILL AVALIBLE IN A CURSE DOWNLOADABLE VERSION OF THE MOD).

iridium_infused_uranium_ingot, mos_neutronium_compound_ingot, strong_iridium_infused_uranium_ingot, and red_compound_ingot:
INSPIRED by textures from the 1.7.10 HBM nuclear tech mod (This is a good mod, download it!).
https://www.curseforge.com/minecraft/mc-mods/hbms-nuclear-tech-mod

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Blocks:
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All variants of inner, outer, and sinking stomach walls:
From More Fun Quicksands mod which is public domain at the time of this writing.
https://www.curseforge.com/minecraft/mc-mods/more-fun-quicksand-mod

organicd, organice and organicf:
https://commons.wikimedia.org/wiki/File:Stomach_endoscopy_1.jpg#mw-jump-to-license
The immage was cropped

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fluids:
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Black and grey templates are filtered immages from More Fun Quicksand mod as well.