Langmans' textbook on Travancore Topography used in Travancore region in 1924
Longman's green company
1924
<p><a rel="nofollow" class="external free" href="https://gpura.org/item/langmansinte-thiruvithamkoor-bhoo-vivaranam-1924">https://gpura.org/item/langmansinte-thiruvithamkoor-bhoo-vivaranam-1924</a>
</p>
<a rel="nofollow" class="external free" href="https://kerala-digital-archive.sgp1.digitaloceanspaces.com/original/d31f97653d01411cb70f61c77a38539efedb79fe.pdf">https://kerala-digital-archive.sgp1.digitaloceanspaces.com/original/d31f97653d01411cb70f61c77a38539efedb79fe.pdf</a>