DOIs that have multiple contributions

[njarboe]

Here is a message from Doug Files, who is working with the EarthCube GeoCODES team on indexing MagIC's contributions:
These are citations that showed up as dups even after taking just the highest version:

2 "https://dx.doi.org/10.1016/0012-821X(88)90058-1"
2 "https://dx.doi.org/10.1016/0012-821X(94)90049-3"
2 "https://dx.doi.org/10.1016/0012-821X(94)90110-4"
2 "https://dx.doi.org/10.1016/0031-9201(77)90118-2"
2 "https://dx.doi.org/10.1016/0031-9201(81)90136-9"
2 "https://dx.doi.org/10.1016/0031-9201(85)90005-6"
2 "https://dx.doi.org/10.1016/0031-9201(89)90032-0"
2 "https://dx.doi.org/10.1016/0031-9201(90)90039-Z"
2 "https://dx.doi.org/10.1016/S0012-821X(01)00259-X"
2 "https://dx.doi.org/10.1016/S0031-9201(02)00095-X"
2 "https://dx.doi.org/10.1016/S0031-9201(99)00170-3"
2 "https://dx.doi.org/10.1029/1999JB900113"
2 "https://dx.doi.org/10.1029/1999JB900448"
2 "https://dx.doi.org/10.1029/2007GL029550"
2 "https://dx.doi.org/10.1029/90JB02223"
2 "https://dx.doi.org/10.1029/94TC03089"
2 "https://dx.doi.org/10.1029/96GL00018"
2 "https://dx.doi.org/10.1029/GL007I007P00545"
2 "https://dx.doi.org/10.1029/GL016I010P01189"
2 "https://dx.doi.org/10.1029/JB079I008P01135"
2 "https://dx.doi.org/10.1029/JB082I020P03039"
2 "https://dx.doi.org/10.1029/JB094IB11P15771"
2 "https://dx.doi.org/10.1038/2101310A0"
2 "https://dx.doi.org/10.1080/00018739700101561"
2 "https://dx.doi.org/10.1111/J.1365-246X.1997.TB00999.X"
2 "https://dx.doi.org/10.1130/0016-7606(1973)84<1217:PAAPOT>2.0.CO;2"
2 "https://dx.doi.org/10.5636/JGG.23.129"
3 "https://dx.doi.org/10.1016/0031-9201(90)90268-3"

So this is a nice list of contributions that need to be merged.