This is an important informatio. I don't know why it is included in professional library guide books. I have looked both in geographic transformation section and working with basemaps section. More importantly though I was trying to project my data which is in North_America_Albers_Equal_Area_Conic into the basemap's WGS_1984_Web_Mercator_Auxiliary_Sphere (after performing transformation a a fly) and they don't align properly anyway.
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