Low ionisation broad absorption line quasars (LIBALQSOs) represent
 about 1% of the Large Bright Quasar Survey (LBQS) and similar
 optically selected samples. They have broad (> 30000 kms) low
 ionisation absorption lines (in particular MgII 2798 Angstroms)
 coming from massive outflowing winds. Whilst they are radio
 quiet, low redshift, low luminosity LIBALQSOs seem to be bright
 in the far-IR, appearing as 3/7 IRAS selected quasars
 in the sample of Low et al (1989 ApJ 340, L1). Their optical-IR
 ratios, IRAS colours and optical-UV spectra all suggest the
 presence of a large quantity of dust. These objects are also
 very strong emitters in UV and (where observable) optical FeII lines.
 The study of these lines in high redshift objects (Elston et al 1994,
 Nature, 367, 250) has recently been used to argue for early rapid star
 formation. If we are to study the role of strong FeII emitters,
 LIBALQSOs are thus the ideal objects to use. Theoretically, the most
 common idea is that all radio quiet QSOs are BALQSOs, but the
 absorption is only visible from certain directions. This cannot be
 the whole explaination though, because BALQSOs show strong NV
 emission and excess radio flux above what would be expected for a
 normal quasar (Francis et al 1993, AJ, 106, 417). An alternative idea
 is that LIBALQSOs are an intermediate stage in the evolution of
 objects like ultraluminous IRAS galaxies (ULIRGs) into quasars. This
 is supported by the fact that Mrk 231, is a LIBALQSO with extreme
 FeII emission. We will obtain ISO observations of LIBALQSOs from the
 LBQS to test these ideas and to determine the nature of these objects.
 Observations with ISO are critical to this study as it is the only
 instrument currently available with the necessary sensitivity and
 wavelength coverage to detect objects like Mrk 231 at high redshift
 in the rest-frame far-IR.