all 3 convergents are marked & 2 of them follow a
watershed
ibs 119 says 1915 aozm boundary pillar number 1 is on
congo zambezi watershed
ibs 144 says 1915 aocd boundary pillar number 1 is
also on congo zambezi watershed
but in an opposite ascending sequence
& indicates that cdzm for which there is no ibs number
terminates at an unratified 1934 pillar 46
so both pillars number 1 are likely the same or
adjacent while pillar 46 is probably also nearby
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