Here is a cheat sheet for anyone starting out in stamp collecting or anyone interested in collecting stamps with printing mistakes.
Errors, freaks and oddities (EFOs) apply to any printing mishaps on stamps. 262 more words
Last week I’ve started a lessons-learned-series on how to deal with imperfect data in the context of spatial modeling and analyses. In a first part I’ve presented how functionally related attributes can be used to bridge gaps in attribute data. 686 more words