In 2020 I was looking at some Philippine language issues in and the following is a list of links that remained open tabs for two years...
The links related to language planning and the term language development. They also related to Linguistic Cartography of the Philippines and digital libraries.
https://www.researchgate.net/figure/Chronological-Map-of-Philippine-Language-Planning_fig1_338829292
https://www.researchgate.net/figure/Chronological-Maps-of-Philippine-and-Thai-Language-Planning_fig3_338829292
http://www.learntagalognow.com/philippines-language-official-map.html
https://kwf.gov.ph/mapa-ng-mga-wika-rehiyon/2/
https://kwf.gov.ph/mapa-ng-mga-wika-rehiyon/
https://kwf.gov.ph/wika/32/
https://files.eric.ed.gov/fulltext/ED593525.pdf