Well, with anonymous type I don't know.
But if you return a known type, how about something like

List<Result> results = new List<Result>(from .....);

as in
==================
class Program
{
 class Result
 {
  public int Index;
  public string Text;
  public override string ToString()
  {
   return string.Concat("Result: ", Index, " ", Text);
  }
 }

 static void Main(string[] args)
 {
  var lines = new string[] {
    "0 HEAD"
   ,"1 CHAR ANSI"
   ,"1 SOUR Ancestry.com Family Trees"
   ,"2 VERS Ancestry.com Family Trees (1)"
   ,"2 NAME Ancestry.com Family Trees"
   ,"2 CORP The Generations Network"
   ,"1 GEDC"
   ,"2 VERS 5.5"
   ,"2 FORM LINEAGE-LINKED"
   ,"0 @P2570715294@ INDI "
   ,"1 SEX F"
   ,"1 NAME Catharina"
   ,"1 FAMS @F198@"
   ,"0 @P2577568933@ INDI "
   ,"1 BIRT "
   ,"2 DATE 1515"
   ,"2 PLAC Cambridge,,Kent,England"
   ,"1 DEAT "
   ,"2 DATE 1590"
   ,"2 PLAC Cambridge,,Kent,England"
   ,"1 SEX F"
   ,"1 NAME John /Fosten/"
   ,"1 FAMS @F252@"
   };

  int i = 0;
  List<Result> results = new List<Result>(from line in lines
            select new Result()
            {
             Index = i++,
             Text = line.Split(new char[] { ' ' })[1]
            });

  foreach (var v in results)
   Console.WriteLine(v);
  foreach (var v in results)
   Console.WriteLine(v);

  Console.ReadLine();
 }
}
==================