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↑	`551.2`	volcanoes, earthquakes, thermal water and gases	→ `904.5`
↑	`551.21`	volcanology	≈ `21F`
↑	`551.22`	seismology, earthquakes	→ `620.3 624.176 ≈ 21E 24B`
↑	`551.23`	thermal water and gases	≈ `23E` `31G`

See also:

↑ 620.3                     mechanic vibration   → 551.22 624.176
↑ 624.176                     seismic engineering   → 363.3 551.22 620.3 693.85
↑ 904.5                     natural events   → 551.2
↑ 21E                     geological exploration of the subsurface. Earthquakes    ≈ 551.22
↑ 21F                     geological exploration of the subsurface. Volcanoes    ≈ 551.21
↑ 23E                     mining geology. Geothermy    ≈ 551.23
↑ 24B                     geophysics. Seismology    ≈ 551.22
↑ 31G                     geothermal energy    ≈ 551.23

SciGator: explore University of Pavia libraries... — <http://scigator.unipv.it/indexe.php> : 2017.02.14 - 2024.11.12 -
« <http://www-dimat.unipv.it/biblio/dewey.php> : 2015.06.18 - 2017

↑	`620.3`	mechanic vibration	→ `551.22 624.176`
↑	`624.176`	seismic engineering	→ `363.3 551.22 620.3 693.85`
↑	`904.5`	natural events	→ `551.2`
↑	`21E`	geological exploration of the subsurface. Earthquakes	≈ `551.22`
↑	`21F`	geological exploration of the subsurface. Volcanoes	≈ `551.21`
↑	`23E`	mining geology. Geothermy	≈ `551.23`
↑	`24B`	geophysics. Seismology	≈ `551.22`
↑	`31G`	geothermal energy	≈ `551.23`