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diff --git a/sys/imio/imbln3.x b/sys/imio/imbln3.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<imhdr.h>
+include	<imio.h>
+
+# IMBLN3 -- Get the length of the axes of a three dimensional subraster.
+# Must be called immediately after the get or put call that created the
+# buffer.
+
+procedure imbln3 (imdes, nx, ny, nz)
+
+pointer	imdes
+int	nx, ny, nz
+int	i, v[3]
+pointer	bdes
+
+begin
+	# Get pointer to most recently used buffer descriptor.
+	bdes = IM_LASTBDES(imdes)
+
+	do i = 1, 3
+	    v[i] = abs (BD_VE(bdes,i) - BD_VS(bdes,i)) + 1
+
+	nx = v[1]
+	ny = v[2]
+	nz = v[3]
+end