Cochrane Library
Go to Cochrane Library and search for (abortion or miscarriage or pregnancy loss) and (recurrent or spontaneous or therapy or treatment or preventing or prevention) in Record Title.

On results screen, see Cochrane Reviews:

• Human chorionic gonadotrophin for recurrent miscarriage. JR Scott, N Pattison. Year: 1996
• Immunotherapy for recurrent miscarriage. JR Scott. Year: 2003
• Progestogen for preventing miscarriage. RM Oates-Whitehead, DM Haas, JAK Carrier. Year: 2003
  
  Protocols (Reviews in process):
  
• Anticoagulants for the treatment of recurrent pregnancy loss in women without antiphospholipid syndrome [Protocol]. M Di Nisio, LW Peters, S Middeldorp. Year: 2004
• Bed rest during pregnancy for preventing miscarriage [Protocol]. A Aleman, F Althabe, J Belizan, E Bergel. Year: 2002
• Therapy for miscarriage associated with antiphospholipid antibody or lupus anticoagulant [Protocol]. M Empson, M Lassere, J Craig, J Scott. Year: 2000
• Vitamin supplementation for preventing miscarriage {Protocol]. A Rumbold, CA Crowther. Year: 2003

• Critical analysis of intravenous immunoglobulin therapy for recurrent miscarriage (Provisional record)
  structured abstract of: Daya S, Gunby J, Porter F, Scott J, Clark DA. Critical analysis of intravenous immunoglobulin therapy for recurrent miscarriage. Human Reproduction Update 1999;5(5):475-482.
• Efficacy of progesterone support for pregnancy in women with recurrent miscarriage. A meta-analysis of controlled trials.
  refers to: Efficacy of progesterone support for pregnancy in women with recurrent miscarriage. A meta-analysis of controlled trials. Daya S. Efficacy of progesterone support for pregnancy in women with recurrent miscarriage. A meta-analysis of controlled trials. British Journal of Obstetrics and Gynaecology 1989;96(3):275-280.
• Intravenous immunoglobulin therapy for recurrent spontaneous abortion: a meta-analysis
  structured abstract of: Daya S, Gunby J, Clark D A. Intravenous immunoglobulin therapy for recurrent spontaneous abortion: a meta-analysis. American Journal of Reproductive Immunology 1998;39(2):69-76.
• Low-molecular-weight heparins in pregnancy
  structured abstract of: Ensom M H, Stephenson M D. Low-molecular-weight heparins in pregnancy. Pharmacotherapy 1999;19(9):1013-1025.

• Management of recurrent early pregnancy loss American College of Obstetricians and Gynecologists (ACOG); 2001 Feb. 12 p. (ACOG practice bulletin; no. 24).
  
  
• list of all results (16) = (miscarriage or pregnancy loss) and management