BLACKROCK LARGE CAP SRS FDS BLACKROCK MUTUAL FUNDS USMF - What does BLACKROCK LARGE CAP SRS FDS BLACKROCK MUTUAL FUNDS USMF mean? - What does BLACKROCK LARGE CAP SRS FDS BLACKROCK MUTUAL FUNDS USMF stand for? - BLACKROCK LARGE CAP SRS FDS BLACKROCK MUTUAL FUNDS USMF meaning