These are the 68 objects for March, April and May
The columns are
Catalogue. NGC or IC
Number in that catalogue
Messier number
Type OC, GC, Neb, PN or Gxy
Sub-type
Constellation
Name of the discoverer
Year found
Visual magnitude
Length and width in arc-mins
RA and declination in decimal
Months when best seen, SON is Sep, Oct, Nov etc
N+45 is north of dec 45
S-45 is south of dec -45
The data is from
http://www.klima-luft.de/steinicke/ngcic/ngcic_e.htm