Combined issue for the months of January and February 1948. Volume 20 is given on the inner title as this issue was published in 1948 and is a part of series Volume 20. Volume and issue number: Volume 20, Issue 1-2 / Volume 20, Issue 1-2.
Volume 21 is gven on the inner title but as it was published in 1948 and is a part of series of volume 20. Volume and issue number: Volume 21, Issue 3 / Volume 21, Issue 3.
Volume 21 is gven on the inner title but as it was published in 1948 and is a part of series of volume 20. Volume and issue number: Volume 21, Issue 4 / Volume 21, Issue 4.
Volume 21 is gven on the inner title but as it was published in 1948 and is a part of series of volume 20. Volume and issue number: Volume 21, Issue 5 / Volume 21, Issue 5.
Volume 21 is gven on the inner title but as it was published in 1948 and is a part of series of volume 20. Volume and issue number: Volume 21, Issue 6 / Volume 21, Issue 6.
