See - How to reconstitute or replace lost/destroyed Land Titles (www.efrennolasco.com)
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Reconstitution of Land Titles Under the Republic Act No. 26 as Amended by R.A 6732 Administrative Reconstitution
This is the flowchart of the reconstitution of land titles because there were cases where land titles were lost due to natural calamities such as floods, fires, etc.