Node: ‪Holcks Bastion‬ (‪2117170672‬)

Node: Holcks Bastion (2117170672)

Improve source for defensive works, add more specific start dates and end dates

defensive_works	bastion
end_date	1888
end_date:source	Skaarup, Dahl. Guide til Københavns Befæstning. 1996. https://www.kobenhavnshistorie.dk/index.php/e-boger/16-bog/gtkb/179-gtkb?showall=1
name	Holcks Bastion
place	locality
source	Trap, J.P. Statistisk-topographisk beskrivelse af kongeriget Danmark. 1872 https://archive.org/details/statistisktopogr01trap
start_date	1670
start_date:edtf	1668/1670
start_date:source	Skaarup, Dahl. Guide til Københavns Befæstning. 1996. https://www.kobenhavnshistorie.dk/index.php/e-boger/16-bog/gtkb/179-gtkb?showall=1

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